Stove-frame and jig for finishing same



Patented Ma'r. I4, I899.

No. 62I,02I.

S. BOAL.

STOVE FRAME-AND JIG FOR FINISHING SAME.

(Application flIed July 16, 1897.)

(No Model.)

THE Nonms PETERS cov PHOTO-LITHO., WASHINGTON, r). c.

I UNITED STATES PATENT OFFICE.

STANHOPE BOAL, OF PIQUA, OHIO.

STOVE-FRAME AND JIG FOR FINISHING SAME.

SPECIFICATION forming part of Letters Patent N 0. 621,021, dated March 14, 1899. Application filed July 16,1897. Serial in. 644,818. (No model.)

To all whom it may concern:

Be it known that I, STANHOPE BOAL, residing at Piqua, in the county of Miami and State of Ohio, haveinvented certain newand useful Improvements in Stove-Frames and Jigs for Finishing the Same, of which the following is a specification.

The object of my invention is to provide a method of finishing stove-castings and appropriate mechanism for accomplishing that result. It is very desirable to make a tightfitting joint for stove-doors to their frames in heating-stoves. Hitherto these parts have been fitted by grinding and filing of the surfaces of the doors and the frames or bases.

This method of finishing the parts is not only costly, but it is nearly impossible to make tight joints. Hence the escape of heat from the inside of the stove and the entrance of cold-air currents from the outside. It has been deemed impractical hitherto to finish these parts by planing, because stove-castings are thin and will not stand the strain of the dressing-tool.

The features of my invention are more fully set forth in the description of the accompanyin g drawings, making a part of this specification, in which Figure 1 is a plan view of the base-plate of a stove. Fig. 2 is a side elevation, partly in section, of myimproved supporting-jack,with a stove base-plate secured in position thereon. Fig. 3 is a face view of my improved supporting-jack. Fig. 4 is a top plan View of the same. Fig. 5 is a section on lineman, Fig. 2. Fig. 6 is a detailed sectional view at right angles to that shown in Fig. 2.

A represents the base-plate, supported by means of suitable thrust and clamping blocks adj ustably mounted upon a swiveled plate B, supported at an angle on the bracket-plate O, which is in turn swiveled upon abed-plate D. This bed-plate D may be the bed-plate of the planing or milling machine, but is preferably a separate plate clamped upon the bed-plate of a planer or milling-machine.

61 represents the swivel-bolt upon which the bracket 0 turns.

0 represents slots through which pass bolts d, by means of which the bracket 0 is clamped to the adjusted position on the bed-plate D. Bracket O is likewise provided with slots 1 2,

through which pass the bolts 3 4, by means of which the plate B is rigidly clamped to its adj usted position.

As shown in Figs. 1 and 2, the base-plate A is provided with an internal web a, running alongbeneath the door-openin g a. This web rests upon thrust-bolts 5 and is clamped between bolts 6 upon one side and bolts 7, supported upon adjustable brackets 8, upon the other side.

9 represents brackets carrying thrust-bolts 10, which support the opposite face of the door-opening. The casting is clamped in position between two sets of bolts 11 and 12, which engage the flange a of the central opening in the base-plate at two different positions, as shown in Fig. 3. These bolts 11 and 12 are supported in the following manner: 13 represents a bracket or clamp-block bolted to the plate B and'through which bolt 11 taps and engages the under side of flange a 14 represents a clamp-plate tapped at its forward end by the bolt 12, while its rear end is connected to and rests upon the projecting end of the block 13. 15 represents a bolt for clamping the plate 14 in position. 16 represents a coil-spring on the shank of the bolt to assist in releasing the clamp when the nut is slackened on bolt 15. 17 represents a thrust-bolt engaging the base-plate in close proximity to the side door A, the same being supported in brackets 18, clamped to the plate B.

The thrust-blocks 8 9 are preferably adjustably secured to the plate A by means of bolts passing through slots in the plate, so that the same may be adjusted to suit different sizes of castings.

By providing means for swiveling the plates B and brackets O, I am enabled to quickly turn the supported casting into position so as to bring the door-openings a or A into position to be acted upon by the tools.

Stove-castings being thin are very apt to warp or spring in cooling. It is essential to dress the surfaces without taking out this set i or Warp when the frames are clamped to the holding-jack, but to dress off such irregulari- 10o ties so as to have the four sides of the dooropening perfectly parallel with each other. This is accomplished in the following manner: The door-frame is placed upon the supporting-bolts 5, 10, and 11, which are vertically adjusted in their brackets so that each of said bolts relatively supports the frame.

Then the clamping-bolts 6, 7, 12, and are turned up so as to tightly clamp the frame in position 011 the holding-jack. Then the surfaces around the door-opening are presented to the action of the dressing-tool and a parallel dressed surface of the four sides of the door-opening is obtained. This dressed portion must be as wide as the abutting flange of the door. The method of finishing the surfaces of the door-flange itself forms the subject-m atter of another application for Letters Patent of the United States filed herewith.

It is essential to swivel the base or door frame not only so that the doors may be dressed upon opposite inclined sides, but in order to present the four surfaces of the dooropening to the action of the dressing-tool.

It will be observed that the web or flange ct, projecting in from the rim of the base below the door-opening, protrudes sufficiently to allow the firm clasp of the laterally-support ing bolts 6 7 as well as the vertical bolt 5. This method of constructing the casting is important, because the narrow rim below the door-opening Without this flange would not have sufficient strength to withstand the action of a planingtool. Again, without this flange there would be no means for clamping this narrow rim to present the casting to the action of the tool. It will be observed that the bracket 9 is employed to support the baseplate of the stove A under the angle or corner, and it is made in two parts adj ustably secured together, so it may be adjusted to fit any angle or style of base-plate. It is essential in the construction of this supporting-jack to have it adjustable upon the table D and that the plate B be swiveled upon this jack and also have means for clamping it in position, as the stove-base has to be turned on the swiveling-plate so as to present the different sides of the door-opening to the action of the tool. When one edge of the door-openin g is dressed, the plate B must be turned one quarter around to trim the edge at right angles thereto. The turning of the jackframe on its baseplate D would not accomplish this result. The angularity of the base 0 and swiveling-plate D depends of course upon the angularity of the face of the base-plate in which the dooropening' is formed.

Having described my invention, I claim- 1. A device for clamping and holding baseframes of stoves in position for dressing their surfaces, composed substantially of a revoluble jack-frame adapted to be supported on the bed of a planer, a base-plate B swiveled upon the inclined face of the jack-frame and carrying a series of vertical and horizontal supporting-bolts bearing against the flanges andundersurfaces of the base-frame of the stove, and a series of holding-down clamps bearing upon the outer face of the base-frame, substantially as described.

2. A base-frame for a stove provided with a holding-flange a, formed integrally with the rim below the door-opening and adapted to be grasped by holding-bolts to hold the baseframe in place on a support on the bed-plate of a planing-machine, as and for the purpose set forth.

In testimony whereof I have hereunto set my hand.

STANI'IOPE BOAL.

lVitnesses:

SETH MoOALLocH, W. B. MITCHELL. 

